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  • The mushroom growing process, sphagnum peat amended with calcium carbonate added on top of mushroom mycelia-colonized substrate (compost) is called casing soil.
  • Casing is a top-dressing applied to the spawn-run compost on which the mushrooms eventually form.
  • Clay-loam field soil, a mixture of peat moss with ground limestone, or reclaimed weathered, spent compost can be used as casing.
  • Casing does not need nutrients since casing act as a water reservoir and a place where rhizomorphs form.


  • The number & yeild of mushrooms increased when leucine, sodium chloride & yeast extract were added to the casing at 10ppm at three day intervals for seven weeks.
  • The size of the fruiting bodies were also found to be larger than that of check treatment.
  • The best yeild was obtained when the trays were treated with yeast extract.


  • The white button mushroom (agaricus bisporus) accounts for 99 percent of all the mushrooms grown in the U.S. Specialty varieties, such as the shiitake and the oyster mushroom.
  • There are 5 or 6 mid-sized farms producing 5 million to 20 million pounds annually, and about 100 farms each producing 1 million to 5 million pounds annually. U.S. specialty mushroom production is dominated by six farms.
  • The Australian governmentís changing policy on tariffs has had a significant impact on the mushroom industry.
  • The only main concentration of operations is in the Hawkesbury district of Sydney, with about half the nationís farms and 40% of production is mushroom.


  • Mushroom compost is used extensively as a substrate for growing mushrooms in the UK and typically consists of straw, animal manure and additives such as chalk, covered by a casing layer of peat.

  • It is useful in life  terms of growing mushrooms, spent mushroom compost retains many properties that are of benefit in soil improvement.

  • Relatively small quantities of spent mushroom compost are therefore used by mainstream producers of branded soil improver products and this material has been captured in the surveys of producer supply data.

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